In this paper we investigate the influence of the video format and of re-scaling on the perceived video quality in the context of IPTV. Addressed resolutions are typical of IPTV: Standard Definition (SD, 720 x 576 pixels) and High Definition (HD, 1920x1080 pixels). Re-scaling comprises SD to HD (4:3, 1350x1080) upscaling and cropping from HD 16:9 (1920x1080) to HD 4:3 (1350x1080) format. In parallel, we analyze the influence of IPTV typical degradations (compression, loss-induced slicing and freezing) on the quality-impact of video format and re-scaling. In addition, we investigate the possibility of modelling the effect of up-scaling on quality and of having one video quality model for both SD and HD by including video format related parameters as additional inputs to the model. A further analysis is provided for discussing the choice of the employed subjective test design. Results show that the quality impact of video format and of re-scaling depends on the amount and type of degradations.
Cite as: Garcia, M.-N., Raake, A. (2010) Quality impact of video format and scaling in the context of IPTV.. Proc. 3rd International Workshop on Perceptual Quality of Systems (PQS 2010), 108-113, doi: 10.21437/PQS.2010-20
@inproceedings{garcia10_pqs,
author={Marie-Neige Garcia and Alexander Raake},
title={{Quality impact of video format and scaling in the context of IPTV.}},
year=2010,
booktitle={Proc. 3rd International Workshop on Perceptual Quality of Systems (PQS 2010)},
pages={108--113},
doi={10.21437/PQS.2010-20}
}